On-Vehicle

IDLE AIR CONTROL (IAC) VALVE ON-VEHICLE INSPECTION





1. INSPECT IAC VALVE FOR OPERATING SOUND
Check that there is a clicking sound immediately after stopping the engine.
If operation is not as specified, check the IAC valve, wiring and ECM.
2. INSPECT AIR ASSIST SYSTEM
A. Warm up engine
Allow the engine to warm up to normal operating temperature.
B. Check idle speed

Idle speed: 700 ± 50 rpm
(Transmission in neutral position)





C. Check IAC Valve Operation
With engine idling, pinch the air hose and check that engine speed drops and then returns back up to idle speed.
If operation is not as specified, check the IAC valve, wiring and ECM.
3. INSPECT IAC VALVE RESISTANCE

NOTICE: "Cold" and "Hot" in the following sentences express the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F).





Using an ohmmeter, measure the resistance between the terminals (B1 (or B2) to others).





Resistance:

If the resistance is not as specified, replace the IAC valve.